@article{SIGMA_2010_6_a13,
     author = {Philippe Di Francesco and Rinat Kedem},
     title = {$Q$-system {Cluster} {Algebras,} {Paths} and {Total} {Positivity}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2010},
     volume = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2010_6_a13/}
}